error-handling - Apache camel 错误处理如何处理多播和事务

Question

我得到了带有 Camel (3.5.0)应用程序的 Spring Boot (2.3.2.RELEASE)和两条测试路线:
这个想法是检查从多播调用的子路由中发生异常时会发生什么以及它如何处理事务。

@Component
public class MyRoute1 extends RouteBuilder {

@Override
public void configure() {

    onException(Exception.class)
        .useOriginalBody()
        .log("Error handler parent. Body is: ${body}")
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                Exception cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                System.out.println(cause.getMessage());
                cause.printStackTrace(System.out);
            }
        })
        .handled(true);

    from("jms:queue:EventsQueue")
        .routeId("route1")
        .onCompletion().log("On complete parent").end()
        .transacted()
        .multicast(AggregationStrategies.useOriginal(), false)
            .to("direct:route2")
            .log("Second step")
        .end()
        .log("Third step");

}
}

和

@Component
public class MyRoute2 extends RouteBuilder {

@Override
public void configure() {

    onException(IOException.class)
        .log("Error handling child");

    from("direct:route2")
        .routeId("route2")
        .onCompletion().log("On complete child").end()
        .log("First step")
        .throwException(new IOException("Very bad exception"));

}

}

当我向 jms:queue:EventsQueue 发送消息时我希望交换将失败并抛出我的异常并遵循自定义日志消息的顺序:

First step
Error handling child
On complete child
On complete parent

不应触发其他日志消息。
但我有以下行为: java.lang.NullPointerException被多播聚合策略抛出并被父级捕获 onException堵塞。所以自定义日志的顺序是:

First step
Error handling child
On complete child
Error handler parent
null
java.lang.NullPointerException
    at org.apache.camel.processor.aggregate.UseOriginalAggregationStrategy.aggregate(UseOriginalAggregationStrategy.java:62)
...
On complete parent

有趣的部分来了:如果我删除 .transacted()父路由行为改变中的方法。 java.lang.NullPointerException异常仍然被聚合策略抛出，但它没有被我的 parent 捕获 onException堵塞。
Camel 原木 .transacted() :

2020-11-03 14:38:35.800  INFO 11744 --- [           main] a.test.errors.MySpringBootApplication    : Started MySpringBootApplication in 3.44 seconds (JVM running for 3.916)
2020-11-03 14:38:46.389  INFO 11744 --- [[EventsPsQueue]] route2                                   : First step
2020-11-03 14:38:46.394  INFO 11744 --- [[EventsPsQueue]] route2                                   : Error handling child
2020-11-03 14:38:46.398 ERROR 11744 --- [[EventsPsQueue]] o.a.c.p.e.DefaultErrorHandler            : Failed delivery for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_3 on ExchangeId: ID-wsc-111-71a-1604403526383-0-2). Exhausted after delivery attempt: 1 caught: java.io.IOException: Very bad exception. Processed by failure processor: FatalFallbackErrorHandler[Channel[log5]]

Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [from[jms://queue:EventsPsQueue]                                               ] [        25]

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------


java.io.IOException: Very bad exception
    at activemq.test.errors.chapter1.MyRoute2.configure(MyRoute2.java:20) ~[classes/:na]
    at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:483) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:430) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:405) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.AbstractCamelContext.addRoutes(AbstractCamelContext.java:1185) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.main.RoutesConfigurer.configureRoutes(RoutesConfigurer.java:93) ~[camel-main-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:101) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:57) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at activemq.test.errors.MySpringBootApplication.main(MySpringBootApplication.java:13) ~[classes/:na]

2020-11-03 14:38:46.400  WARN 11744 --- [[EventsPsQueue]] o.a.c.s.spi.TransactionErrorHandler      : Transaction rollback (0x347b370c) redelivered(false) for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_3 on ExchangeId: ID-wsc-111-71a-1604403526383-0-2) caught: java.io.IOException: Very bad exception
2020-11-03 14:38:46.401  INFO 11744 --- [[EventsPsQueue]] route2                                   : On completion child
2020-11-03 14:38:46.401  INFO 11744 --- [[EventsPsQueue]] route1                                   : Error handler parent. Body is: TEST MESSAGE
null
java.lang.NullPointerException
    at org.apache.camel.processor.aggregate.UseOriginalAggregationStrategy.aggregate(UseOriginalAggregationStrategy.java:62)
    at org.apache.camel.AggregationStrategy.aggregate(AggregationStrategy.java:86)
    at org.apache.camel.processor.MulticastProcessor.doAggregateInternal(MulticastProcessor.java:628)
    at org.apache.camel.processor.MulticastProcessor.doAggregateSync(MulticastProcessor.java:609)
    at org.apache.camel.processor.MulticastProcessor.doAggregate(MulticastProcessor.java:594)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.aggregate(MulticastProcessor.java:413)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$null$0(MulticastProcessor.java:393)
    at org.apache.camel.AsyncCallback.run(AsyncCallback.java:44)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.schedule(DefaultReactiveExecutor.java:55)
    at org.apache.camel.processor.CamelInternalProcessor$AsyncAfterTask.done(CamelInternalProcessor.java:186)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:129)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$run$1(MulticastProcessor.java:367)
    at org.apache.camel.util.concurrent.AsyncCompletionService$Task.run(AsyncCompletionService.java:150)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.MulticastProcessor.process(MulticastProcessor.java:273)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:164)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:261)
    at org.apache.camel.processor.Pipeline$PipelineTask.run(Pipeline.java:90)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:145)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.spring.spi.TransactionErrorHandler.access$201(TransactionErrorHandler.java:45)
    at org.apache.camel.spring.spi.TransactionErrorHandler$2.process(TransactionErrorHandler.java:238)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processByErrorHandler(TransactionErrorHandler.java:235)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:110)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:123)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.spring.spi.TransactionErrorHandler.access$201(TransactionErrorHandler.java:45)
    at org.apache.camel.spring.spi.TransactionErrorHandler$2.process(TransactionErrorHandler.java:238)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processByErrorHandler(TransactionErrorHandler.java:235)
    at org.apache.camel.spring.spi.TransactionErrorHandler$1.doInTransactionWithoutResult(TransactionErrorHandler.java:198)
    at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:36)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
    at org.apache.camel.spring.spi.TransactionErrorHandler.doInTransactionTemplate(TransactionErrorHandler.java:191)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processInTransaction(TransactionErrorHandler.java:146)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:114)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:123)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.processor.Pipeline$PipelineTask.run(Pipeline.java:90)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:147)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41)
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:130)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:696)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:674)
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:318)
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:245)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1189)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1179)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1076)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
2020-11-03 14:38:46.407  INFO 11744 --- [[EventsPsQueue]] route1                                   : On complete parent
2020-11-03 14:38:46.411  WARN 11744 --- [[EventsPsQueue]] c.c.j.DefaultJmsMessageListenerContainer : Setup of JMS message listener invoker failed for destination 'EventsPsQueue' - trying to recover. Cause: Transaction rolled back because it has been marked as rollback-only

没有事务支持的 Camel 日志:

2020-11-03 14:40:27.748  INFO 11981 --- [           main] a.test.errors.MySpringBootApplication    : Started MySpringBootApplication in 3.234 seconds (JVM running for 3.643)
2020-11-03 14:40:36.828  INFO 11981 --- [[EventsPsQueue]] route2                                   : First step
2020-11-03 14:40:36.832  INFO 11981 --- [[EventsPsQueue]] route2                                   : Error handling child
2020-11-03 14:40:36.837 ERROR 11981 --- [[EventsPsQueue]] o.a.c.p.e.DefaultErrorHandler            : Failed delivery for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_4 on ExchangeId: ID-wsc-111-71a-1604403636824-0-2). Exhausted after delivery attempt: 1 caught: java.io.IOException: Very bad exception. Processed by failure processor: FatalFallbackErrorHandler[Channel[log5]]

Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [from[jms://queue:EventsPsQueue]                                               ] [        24]

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------


java.io.IOException: Very bad exception
    at activemq.test.errors.chapter1.MyRoute2.configure(MyRoute2.java:20) ~[classes/:na]
    at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:483) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:430) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:405) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.AbstractCamelContext.addRoutes(AbstractCamelContext.java:1185) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.main.RoutesConfigurer.configureRoutes(RoutesConfigurer.java:93) ~[camel-main-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:101) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:57) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at activemq.test.errors.MySpringBootApplication.main(MySpringBootApplication.java:13) ~[classes/:na]

2020-11-03 14:40:36.838  INFO 11981 --- [[EventsPsQueue]] route2                                   : On completion child
2020-11-03 14:40:36.839  INFO 11981 --- [[EventsPsQueue]] route1                                   : On complete parent
2020-11-03 14:40:36.848  WARN 11981 --- [[EventsPsQueue]] o.a.c.c.jms.EndpointMessageListener      : Execution of JMS message listener failed. Caused by: [org.apache.camel.RuntimeCamelException - java.lang.NullPointerException]

org.apache.camel.RuntimeCamelException: java.lang.NullPointerException
    at org.apache.camel.RuntimeCamelException.wrapRuntimeCamelException(RuntimeCamelException.java:51) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener$EndpointMessageListenerAsyncCallback.done(EndpointMessageListener.java:213) ~[camel-jms-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:134) ~[camel-jms-3.5.0.jar:3.5.0]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:696) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:674) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:318) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:245) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1189) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1179) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1076) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.lang.NullPointerException: null
    at org.apache.camel.processor.aggregate.UseOriginalAggregationStrategy.aggregate(UseOriginalAggregationStrategy.java:62) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.AggregationStrategy.aggregate(AggregationStrategy.java:86) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregateInternal(MulticastProcessor.java:628) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregateSync(MulticastProcessor.java:609) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregate(MulticastProcessor.java:594) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.aggregate(MulticastProcessor.java:413) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$null$0(MulticastProcessor.java:393) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.AsyncCallback.run(AsyncCallback.java:44) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:147) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41) ~[camel-support-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:130) ~[camel-jms-3.5.0.jar:3.5.0]
    ... 11 common frames omitted

问题是:

为什么我有 java.lang.NullPointerException如果在子路由中发生其他异常，则在多播期间。

为什么有事务支持和没有事务支持时我有不同的错误处理行为。

我会很高兴得到任何帮助或建议!

Answer 1

对于 onException，还有另外两件事可以设置为 真或 假 分别是 handled 和 continued .我认为这些向您解释了异常如何传播到父路由。

If handled is true, then the thrown exception will be handled and Camel will not continue routing in the original route, but break out

https://camel.apache.org/manual/latest/exception-clause.html#ExceptionClause-WhatistheDifferenceBetweenHandledandContinued

In Camel 2.3 we introduced a new option continued which allows you to both handle and continue routing in the original route as if the exception did not occur.

https://camel.apache.org/manual/latest/exception-clause.html#ExceptionClause-HandleandContinueExceptions
关于那个 transacted()我不知道。我正在阅读它，如果我找到答案，会将您链接到该答案。